Clarify "top of the stack"

[vedantroy]

It would be helpful to use different term than "top" to refer to the first "element" in the stack that would be popped off. Maybe, tip or head?

Here's a sentence that felt confusing:

"".b+12(SP) and "".a+8(SP) respectively refer to the addresses 12 bytes and 8 bytes below the top of the stack (remember: it grows downwards!).

From this sentence, I thought the stack looked like as follows (here the stack is growing downwards):

RETURN ADDRESS 0(SP)
Argument A 8(SP)
Argument B 12(SP)

However, the diagram in the book is as follows:

   |    +-------------------------+ <-- 32(SP)              
   |    |                         |                         
 G |    |                         |                         
 R |    |                         |                         
 O |    | main.main's saved       |                         
 W |    |     frame-pointer (BP)  |                         
 S |    |-------------------------| <-- 24(SP)              
   |    |      [alignment]        |                         
 D |    | "".~r3 (bool) = 1/true  | <-- 21(SP)              
 O |    |-------------------------| <-- 20(SP)              
 W |    |                         |                         
 N |    | "".~r2 (int32) = 42     |                         
 W |    |-------------------------| <-- 16(SP)              
 A |    |                         |                         
 R |    | "".b (int32) = 32       |                         
 D |    |-------------------------| <-- 12(SP)              
 S |    |                         |                         
   |    | "".a (int32) = 10       |                         
   |    |-------------------------| <-- 8(SP)               
   |    |                         |                         
   |    |                         |                         
   |    |                         |                         
 \ | /  | return address to       |                         
  \|/   |     main.main + 0x30    |                         
   -    +-------------------------+ <-- 0(SP) (TOP OF STACK)

Looking at this diagram I see that the top of the stack refers to the bottom of the stack, but it might be nice to use different terminology.